Magneto



Jan, 13. 1925. 1,522,747

A. RosNl-:R

MAGNETO meinen. 7,' `1921 2 sheets-sheet 1 A? A ,clpoLpH ROSNER.

JB 5- ATTORNEY Jan. 13. 1925.

L52Z747 A.RosNER 'MAGNETC Filed Dec. 7, 1921 76 :9

. INVENTOR @ik @w ATTORNEY HDOLPH ROSNER Patented Jan. 13, 1925.

UNITED STATES PATENT OFFICE.

ADOLPH. ROSNER, OF SFRINGEIELD,

BOSCH MAGNETO CORPORATION, OF TION OF NEW YORK.

MfaG-NETO.

Application filed December 7, 1921. Serial N'o. 520,700.

T 0 all whom t muy concern.'

Be it known that l, ADoLPH Bosnian, a citizen of the United States, residing at 4 Ventura Street, Springfield, in the county oi' Hampden, State ot Massachusetts, have invented certain new and useiul .improvements in h/Iagnetos; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to magnetos of the rotary or oscillating type, and partieularly to the structural parts thereo, such as the frame, bearings, timing mechanism and collector brush-holder.

Heretotore, it was customary, both in built-up frames in which the pole shoes were detachably fastened to the base plate and also in cast frames in which the pole shoes were cast as inserts in the trame, to provide detachable end plate havingan extension forming the interrupter housing for lined timing, or else orming a bearing support for an interrupter housing rotatable thereon "for variable timing of the magneto.

ln accordance with this part of my invention, the magneto has a one-piece trame .vhicfh i-,irins housings oi substantially a un. rm bore for both the rotor and the interrupter, so that by passing the rotor through the interrupter housing in assemiling the magneto, the machining and fitting` of the frame is reduced considerably.

Tn "this construction, bearings are provided for both ends of the rotor, one of which may be formed by substantially closing or Hanging one end ot the frame. At the other end of the ame there may be an integral extension within which a bearing member or ring is detachably supported and preferably is seated against a shoulder. rlhe interrupter may be housed within the ension outwardly of the bearing member lt was also customary, heretofore, when using variable ignition, to either externally internally machine the flange ot the detachable end plate to Yform a bearing support for the interrupter housing, which carried 'ihj cams. Un ess the bearing support were made long, and was accurately machined and centered, the housing would cant "from axial alinement and would also be eccentric to the aXis of the"` end plate and armature, thus introducing 'inaccuracies in the timing of one or both of the sparks in a single rotation of the armature. Moreover, it was necessary to make the housing thick in order to avoid distortions which would also produce timing errors.

In accordance with another part of my invention, whether or not the frame is a one-piece structure having a substantially uniform bore for both the rotor and interrupter housings, the interrupter has a rotatable cam carrying member or ring which is supported within the interrupter housino'. Means, preferably in the form of a rotatable cap supported by the interrupter housing and having a rigid timing arm, may be provided for the purpose of turning this member for ti ning the magneto.y The cap and `the cam carrying member may have cooperative means, preferably in the form of pin and slot connections, by which 'the turning of the cap turns the cam carrying member to time the magneto, and these cooperative means preferably providefor selectively mounting the cap, so as to bring the turning means, such as the timing arm, to any one et several positions suitable to different engine installations.v The cap, moreover, may be arranged to close the interrupter housing and toalso bear against the cam carrying member by holding means which acts not only to hold the cap in contact with such member, but also to maintain contact between suoli member and the bearing member, and between the bearing member and the shoulder' which limits the .inward positioning` of the bearing member.

In prior devices, it was not customary to make corrective adjustments for manufacturing variations of the edge distance, by which is meant the width of the gap between the parting edges of the rotor and stator pole pieces at the instant ot separation of the interri-.pter contacts at the point ot maximum advance of the interrupter cam. ln some cases, however, when such edge distance7 was incorrect for obtaining the most eiticient spark, adjustment was made by changing the point ot maximum advance of the interrupter cam by filing one end of the timing slot in the interrupter housing. In another case, the frame of the magneto carried adjustably fixed plates having pins co-acting with the interrup-ter housing, which carried the interrupter cams, for adjustably determining the maximum point of advance of the cams.

In accordance with this part Vof my invention, whether or not the frame is a onepiece structure having a substantially uniform bore for both the rotor and interrupter housings, the frame has a bore providing for the passage of the armature therethrough when assembling the magneto, and a bearing member and the frame have cooperative means, preferably in the form of screw connections, for holding the bearing member in angularly` 'adjusted position. If desired, a locking pin may be used to lock the bearing member in fixed` relation in the frame after adjustment is made. The cam carrying member of the interrupter is movable with the bearingmember, prefere ably by cooperative pin and slot connections, so as to be adjusted angularly by and with such member. In this way the correct edge distance is obtained with facility.

VIn the accompanying drawing illustrating my invention in application, as an example, to a single cylinder magneto of the rotary armature type arranged for one sparkper rotation:

Fig. 1 is a view in side elevation of the magneto; Fig. 2 is a view in vertical longitudinal section of the` same; Figs. 3 and 4 are fragmentary sectional views showing the use y of plain bearings at the ends of the magnetov frame instead of ball bearings, as is shown in Fig. 2; Fig. 5 is a transverse sectional view taken on line 5 5 of Fig. 4; Fig. 6 is a transverse sectional view taken on line 6 6 of Fig. 2; Fig. 7 is an end view, with parts broken away, of the magneto; Fig. 8 isa similar view showing a different form of end cap omitting the grounding connection; Fig. 9 is a perspectiveview of the in-V terrupter cam; Fig. 10 is a fragmentary sectional view taken on line 10*1O of Fig. 2; and Fig. 11 is a sectional view of an interrupter cap bearing a grounding connecting post.

Referring more in detail to the drawings, the invention is embodied in a magneto comprising a permanent magnet 1 of U-shape supported upon a frame 2 which is preferably of cast aluminum and formed in a single piece with a substantially closed or flanged end 3 and an extension 4, the latter being formed integral with the body portion of the frame 2. The frame thus forms a one-piece construction forming housings of substantially a uniform bore for the armature and the interrupter. Then the frame 2 is cast, the pole pieces 5 are also cast with it, so as to form a rigid part of the frame. Before t-he casting operation, the pole pieces are connected together by spacing members 6 and 7 which are secured to the pole pieces by suitable securing means, such as pins 8 and v9, for the purpose of holding the pole shoes 5 in proper spaced relation when the molten metal of the frame is cast about these shoes. The magnetV 1 is preferably a single fiat bar of U-shape, as shown upon the drawing, and is made shorter than usual so as to provide a space beneath the lower ends 10 of the magnet and the base plate orY portion' 11 of the frame 2. The magnet is then held in place upon the frame by means of a flexible metal strap 12, which has its ends bent around the lower ends 10 of the magnet and connected to steps 13 by means of rivets 14, as is clearly shown in Fig. 6 of the drawing. These steps 13 are preferably made of aluminum but may be made of any other suitable material, whether magnetic or nonmagnetic, or whether metallic or non-metallic. They are also apertured to receive securing screws 15 threaded into the pole shoes 5, for tightly holding the ends of the straV Y12 about the ends 10 of the magnet.

l ithin the frame 2 is located an armature 16, preferably of the rotating type, and having a core 17 provided with extensions 18, and also primary and secondary Vwindings 19 and 2O about the core 17. At one end of the armature is secured the condenser casing 21, and at the other end of the'casing is an end plate 22 carrying a collector spool 23. At "both ends of the armature are provided shafts 2&1 and 25, the former 'being supported in a bearing 26 which may be of the ball bearing type, as shown in F ig. 2, or may be in the form of a plain bearing 27, as shown in Fig. 3 of the dra-wing, while the shaft 25 is supported in a bearing 28, which may be of the ball bearing type, as shown in Fig. 2, or in the form of a plain bearing 29, as shown in Fig. 4 of the drawing. rlhe bearings 26 and 27 are supported in the closed end 3 of the frame 2 cup 30, of any suitable type, being provided in the end portion 3 to supply a lubricant to-a wick 31 cooperative with the bearing 26 or 27, as sh-own in Figs. 2 and 3 of the drawing. The shaft 24 has a tapered end 32 to which may be keyed, by means of a key 33, a trip lever yoke, when the magneto is of the oscillating type, or a driving member connected with the engine, such as a cam shaft, when t-he magneto is of the rotary type, the yoke orrthe driving member being held secured to the portion 32 by means of a nut 34 and a lockwasher 35 connected to the threaded end 36 of the shaft2et. At the other end of the armature, it will be noted that the bearing 25 is supported either in the bearing 28 or the plain bearing 29 surclearly shown in Fig. of the drawing.

roundeduby a bearing carrying member or ring 37-which fits within the bore of the frame 2, and is seated against an annular' shoulder 38 formed in the frame 2. The frame 2 also has, in this vicinity, a pair of apertures 40, through which extend adjusting screws 41, which are threaded into the ring 37 and adapted to bind against bosses 42 formed` integral with the frame 2, as

t will be observed that the; apertin s are of larger diameter than the diameter of the shanls of the screws 4l, so that the latter may have a certain amount of play or angular movement within the apertures 40, for the purpose of permitting a certain amount of angular adjustment of the bearing carrying ring 37 within the frame 2, for a purpose hereinafter more fully described. In the top of the frame 2, opposite the ring 37 is located an oil cup 43, which supplies. a lubricant to a wick 44 located in a radially disposed passage in the member 37 and cooperative with the `bearing 28 or 29 forlubrication thereof. At the 'bottom of the frame 2'is formed a threaded aperture 45 adapted to receive a lock screw 46 having its inner end 47 smooth and fitting into a radial recess drilled into the member 37, as is clearly shown in Fig. 5 of the drawing, the head of` the screw 46 fitting into a recess formed in a boss 48 formed integral with the frame 2. The head of this screw, may, if desired, be sealed after adjustment is made to render further adjustment difhcult, after adjustment is made by the manufacturer. j,

Adjacent the bearing supporting member 37, and in contact with it, is located a cam carrying member 49, in the form of a rino, having its outer periphery circular and its inner periphery formed with a cam surface, although the inner periphery of the ring may be of other coniiguration, depending upon the number of cylinders in the engine. The type of magneto herein described and shown upon the drawing is for use upon an engine having a single cylinder and accordingly, the cam has one lobe 50.y for cooperation with the interrupter mechanism. The end of. the shaft ext-ends beyond the member 37 and carries an interrupter mechanism comprising a base plate 51, an end fastening screw 52, and the other elements that usually go to make up the usual type of interrupter used in magnetos. The interrupter mechanism rotates with the shaft, and during each revolution cooperates with the lobe 50 of the cam 49 to open and close the contacts of the interrupter, and thus interrupt the circuit of the primary winding` of the armature, such opertion being well known in the art without further description.V The ring 49 rotatablyr its within the extension 4 of the frame 2, and is capable of angular adjustment or turning movement therein. Such adjustment. however,l is limited by a stop screw threaded into the bearing carrying member 37, as is clearly shown in Fig. 2 of the drawing, the screw 53 extending into an elongated sloty 54 formed in the ring 49 or in the slot 55, as the case may be, and as is clearly shown in Fig. 9 of the drawing. 'Then using variable ignition, the ring 49 is located in the extension, so that the screw 53 will extend into the slot 54, the ring 49 then being angularly movable to the extent of the length of of the slot 54, but when fixed ignition is used, the ring 49 is then located in the extension, so that the head of the screw 53 will extend into the slot instead of the slot 54, the ring 49 in such case not being angularly adjustable, but being in iixed relation to the other parts of the magneto.

The opened end of the extension is then closed by an interrupter cap 56 which is of' convex form and has a flanged portion 57 fitting within the opened end of the extension and contacting with the outer end of the ring 49. This cap is held in position by a spring 58 bearing at its free end against the center ofthe cap 56 and connected at its other end to a short post 59 threaded into or fastened to an enlargement 60 formed at the upper portion of the extension 4Q The pressure of the spring is such that it holds the cap 56, the cam 49 and the ring 37, in place in the frame Q., the

pressure of the spring 58 against the capY 56 being successively effective upon and transmitted through the ring 49 and the bearing caf ying ring 37 to the annular shoulder 38, the ring 37 being thus held seated on such shoulder. in this way the spring serves to hold all of these members in alignment and in position. The cap 56 is provided with a number of radially cut recesses or notches 6l into any of which extends the head 62 of a pin 63 fixed to or fastened into one of the recesses 64 formed in the ring 49. Any turning movement of the closure cap 56 will effect a like turning movement in the ring 49. The cap 56 also is termed with an integral timing arm 65 to which may be connected any actuating means, running to a point accessible to the operator of the engine., for varying the time of the ignition. It will be noted that the amount of adjustment is limited by the abutment screw 53, as above described; The cap 56 is shown in Fig. 7 with -four recesses or notches at 90O from each other, so that the cap 56 may be connected in position in any one of four positions, so that the timing arm 65 may extend out horizontally, either to the right or the left, or vertically downwardly or upwardly, as may be most convenient for the particular installation made of the magneto on the engine, such positions of the arm 65 being'shown in full and dotted lines in Fig. 7 of the drawing. In the `form shown in Figs. l and 2, 7 and 1l, the cap carries a grounding binding post 66 which is surrounded by an insulating sleeve 67 extending-through the cap 56. At its inner end the post 66 is connected to a conducting spring 68 having a carbon brush 69 at its free end and adapted to bear against the end of the center fastening screw 54 of the interrupter mechanism. rEhe outer end of the post 66 has binding nuts 70 and 7l, between which may be clamped the end of the grounding lead in a well known manner. Vrilhis grounding connection, however, may be omitted, it desired, and the cap accordingly formed without such grounding post, as shown in Fig. 8 of the drawing. rlfhis closure cap is, in otherf respects, the same in t "construction as that shown in Figs. 2, 7 and 11. In the former case when it is desired to stop the engine, the magneto is grounded or short circuited through the post 66, but in the latter form, when such grounding connection is omitted, the engine is stopped byv simply withdrawing the high tension Vconnection.

The frame 2 also carries at the top thereof, a grounding brush 72 threaded into the frame 2 and extending inwardly into contact with the condenser casing 22, so as to form a ground connection with one side of the condenser and the frame 2, in a manner understood in the art.

At the other end of the magneto is located a collector brush holder 73 formed of insulating material, such as bakelite, and having therein a metal insert 74 forming an electrode. The latter is recessed at its outer end4 to receive a terminal of a high tension lead, and is connected at its inner end by means of a spring 75 to a flat brush 76 bearing against va metal track 7 7 Von the spool 23, the latter beingotherwise formed of bakelite or similar insulating material. The brush 76 is flat or is rectangular in cross section with its width extending in a plane transverse to the axis ofthe armature, and having its shortest dimension extending axially of the armature. It will be observed also that the body of the collector 73 is enlarged and formed with a flange portion 78 which overhangs an upwardly extending annular portion 79 of the frame 2, the flange portion acting' as a water shed and preventing the entry of water within the interior of the frame 2-upon the. collector spool 23.

ln assembling the parts of the magneto, the armature is introduced through the bore of the extension 4, so that the shaft portion 35 is inserted in the bearing 27, and then the bearing carrying ring 37 carrying the bearing 39 is inserted to support the shaft portion 35. The member 37 is turned to a position, so that it may receive the screws 41,

vthe core extensions 18 andthe pole shoes 5.

Adjustment is made by adjusting the limiting position of the stop pin 53, thus adjusting thepoint of maximum advance of the camv50, as a consequence. This is accomplished by angularly moving the member Y37 to either advance or retreat vthe limiting p0- sition of the pin 53. The point of maximum advance ot' the cam 50 is then determined by the abutting of one end of the slot 54 against the pin 53. When this position is determined, the screws 41 are then tightened so as to hold the member 37 in fixed adjusted relation. A drill bore is thenrnade into the lower portion of the member 7, andthe screw 46 then threaded into place and tightened to lock the member 37 in its angularly adjusted position, after which the head of the screw 46 may be sealed as above mentioned. The apertures 40, as above stated, are of sufficient size to permit the desired amount of angular adjustment. Whilethe screws 4l are left in tightened condition, it is immaterial whether or not they beome loosened 10Q after the locking pin 46 has been inserted in place.V i

Having thus described my invention, what I claim is:

i. A magneto comprising a permanent 105 magnet, an armature cooperative with the o magnet, an interrupter coopera-tive with the armature, an imperforate interrupter housing, said interrupter having a cam-carrying lmember located wholly within the interrupt-er housing, and a cap closing the interrupter housing and having means cooperative with the cam-carrying member for timing the magneto,

2. A magneto comprising a permanent magnet, an armature cooperative with the magnet, an interrupter cooperative with the armature, an imperforate interrupter housing, said interrupter having-a cam-carrying member located wholly within the interrupter housing', and a cap rotatably supported by the interrupter housing and having means cooperative with the cam-carrying member for timing the magneto.

3. A magneto comprising a permanent magnet, an armature cooperative with the magnet, an interrupter cooperative with the armature, an imperforate interrupter housing, said interrupter having a cam-carrying member located wholly within the interported by-said housing and having a pin and slot Connection Cooperative with the cam-carrying member for tiniiing the magneto.

4. A magneto oon'nprising a permanent magnet, an armature cooperative With the magnet, an interrupter Cooperative Wit-h the armature, an impertorate interrupter housing, said interrupter having a cam-carrying member located Wholly Within the interrupter housing, and a Cap rotatably supported by the housing and having means Cooperative With the cam-carrying member for turning it, said Cap carrying a timing arm for timing the magneto.

5. A magneto comprising a `permanent magnet, an armature cooperative With said magnet, an interrupter connected to said armature and having a rotatable cam carrying member, a one-piece frame forming housings of substantially a uniform bore for both the armature and the interrupter, said Cam carrying member fitting in said bore, and movable means for timing the magneto by turning said member Within said bore.

6. A magneto comprising a permanent magnet, an armature cooperative With said magnet, an interrupter connected to said armature kand having a rotatable cam carrying member, a one-piece frame forming housings of substantially a uniform bore tor both the armature and the interrupter, said cam Carrying member fitting in said bore, and a rotatable oap for said interrupter housing, said cap and member having cooperative means for timing said magneto by turning said cap to turn said member in said bore.

7. A magneto comprising a. permanent magnet, an armature Cooperative with said magnet, an interrupter connected to said armature and having a rotatable cam ring, a one-piece frame forming housings of substantially a uniform bore for both the armature and the interrupter, said cam ring titting in said bore, and movable means for timing the magneto by turning said member Within said bore.

8. A magneto comprising a permanent magnet, an armature cooperative with said magnet, an interrupter connected to said armature and having a rotatable oam Carrying member, a one-piece frame forming housings of substantially a uniform bore for both the armature and the interrupter, said cam carrying member fitting in said bore, and a rotatable Cap fitting in said bore for timing the magnet by turning said member Within said bore. Y

9. A magneto comprising a permanent magnet, an armature cooperative with said magnet, an interrupter connected to said armature and having a rotatable cam carrying member, a one-piece frame forming housings of substantially a uniform bore for both -the armature and the interrupter, said Cam Carrying member-itting in saidbore, and a rotatable closure cap having a rigid timing arm and i'itting in said bore for timing the magneto by turning said member Within said bore.

l0. A magneto comprising a permanent magnet` an armature Cooperative with said magnet, an interrupter connected to said armature and having a rotatable cam carrying member, a frame having an extension housing said interrupter and having a bore providing for the passage of the armature therethrough, a detachable bearing member in said bore, a shoulder limiting the inward positioning of said bearing member, said Cam carrying member being located in said bore against said shoulder and outwardly thereof a Cap closing said extension and bearing against said Cam carrying member, and means for holding said Cap and member in Contact.

ll. A magneto Comprising a permanent magnet, an armature cooperative with said magnet, a frame having a bore providing for the passage of said armature therethrough, an interrupter Connected to said armature and having a eam Carrying member, a bearing member for said armature rotatably supported in said bore, said frame and bearing member having cooperative means for holding` said bearing member in angularly adjusted position, said cam Carrying member being movable with said bearing member when adjusting said bearing member.

l2. A magneto comprising a permanent magnet, an armature Cooperative with said magnet, a frame having a bore for the passage of said armature therethrough, an interrupter connected to said armature and having a cam Carrying member, a bearing member for said armature rotatably supported in said bore, said 'frame and bearing member having Cooperative means for holding said bearing member in angularly adjusted position, said Cam carrying member and said bearing member having cooperative means for angularly adjusting the position of said cam carrying member when adjusting said bearing member.

13. A magneto comprising a permanent magnet, an armature Cooperative with said magnet, a frame having a bore for the passage of said armature therethrough, an interrupter connected to said armature and having a eam Carrying member, a bearing member rotatably supported in said bore, said frame and bearing member having cooperative means for holding said bearing member in angularly adjusted position, said cam carrying member j and said bearing member having cooperative means for angularly adjusting' the position of said cam carrying member When adjusting said bearing members, and means for locking said bearing member in adjusted position.

14. A magneto Comprising a permanent Amagnet, an armature cooperative With said magnet, a frame Vhaving a bore for the passage of said armature therethrough, an interrupter connected to said armature and having a cam carrying member, a bearing member rotatably supported in said bore,

said frame and bearing member having cooperative means for holding said bearing member in angularly adjusted position, said Cam carrying memberand said bearing member having cooperative means for angularly adjusting the position of said Cam carrying member When adjusting said bearing member, and a looking pin on said frame for looking said bearing member in adjusted posaid Jframe and bearing member having` cooperative means for holding said bearing member m angularly adjusted position, said Cam carrying member and vsaid bearing Vmember having cooperative pin and slot connections for angularly adjusting the position of said cam carrying member when Vadjusting said bearing member,

ture.. 1

16. A magnetoV Comprising a permanent magnet, an armature cooperative With said magnet, a frame having a bore for the passage of said armature therethrough, an interrupter connected to said armature and having a Cam carrying member, a bearing member rotatably supported in said housing, said frame and bearing member having cooperative screw connections, for holding said bearing member in angularly adjusted position, said cam Carrying member and said beai'ing member having cooperative means for angularly adjusting the position of said` cam carrying member When adjusting said bearing member.

17. A magneto comprising a permanent 'magnet, an armature cooperative With said magnet, a frame having a bore for the passage of said armature therethrough, an

`interrupterV Connected to said armature and having a cam Carrying member, a'v bearing member rotatably supported in said bore, said frame and bearing member having cooperative 4screw connections for holding said bearing member in angularly adjusted position, said cam carrying member and said bearing member having cooperative pin and slot connections for angularly adjusting the position of said Cam carrying member When adjusting said bearing member, and a locking pin'on said frame for locking said bearing member in adjusted position.

In testimony whereofV I aniX my signa- AADOLPH ROMSNER. 

